Would there be economic pain in Canada???? You betcha. But we're part of the TransPacific Partnership, the British Commonwealth, and since 2008, we've signed trade deals throughout the first world, including Japan and the EU.
Tarriff's are paid by the purchaser, not the seller. We're still getting the same amount of money for our goods, but Canadians stopped buying American goods when Trump slapped the tariff's on, and our exports to the USA went UP not down. We'll just stop buying American made products, and you bet your ass Apple and other big American companies will be selling us their products from their European headquarters in Ireland
Canada and Mexico had been asking to renegotiate NAFTA for years, and insteading of saying "Yes", Trump slapped tarriffs on us and demanded we renegotiate in 2018. US exports to Canada dropped by $7 billion per year in 2019, and a further $36 billion the following year. Our trade surplus went from $18 billion in 2018 under the old agreement, to $68 billion in 2023 under Trump's Agreement.
www.census.gov
The rest of the world has become less and less reliant on the USA as you've become more and more economically unstable. Ever since 2008, governments all over the world have been trying to be less reliant on the US for anything in future.
Your election of Donald Trump in 2016, and the economic chaos that ensued when he tore up all of your trade agreements, combined and the possibility of him being re-elected, is acclerating that process.